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Humic Acid Fertilizer Incorporation Increases Rice Radiation Use, Growth, and Yield: A Case Study on the Songnen Plain, China

Author

Listed:
  • Ennan Zheng

    (School of Hydraulic and Electric Power, Heilongjiang University, Harbin 150080, China)

  • Mengting Qin

    (School of Hydraulic and Electric Power, Heilongjiang University, Harbin 150080, China)

  • Zhongxue Zhang

    (School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China)

  • Tianyu Xu

    (School of Hydraulic and Electric Power, Heilongjiang University, Harbin 150080, China)

Abstract

Humic acid fertilizer (HA) incorporation is a common method for improving crop growth and soil fertility. However, the effects of HA incorporation on rice growth are still unknown. We conducted a two-year field experiment to determine the radiation use, growth, and yield of rice grown with five different HA rates: 110 kg∙ha −1 100% urea (pure nitrogen) (T1); 30% HA and 70% urea (T2); 50% HA and 50% urea (T3); 70% HA and 30% urea (T4), and 1500 kg∙ha −1 100% HA (T5). The results showed that the T2 treatment had the lowest values of photosynthetic efficiency of PSII ( F v /F m ), relative leaf chlorophyll content ( SPAD ), plant height and leaf area index ( LAI ) in both years, which were similar to the photosynthetically active radiation ( IPAR ), radiation use efficiency ( RUE ), yield, and biomass. In contrast, the highest harvest index ( HI ) value was found in the T2 treatment. In the two years, the T4 and T5 treatments showed no significant differences. However, the multivariate statistical method based on principal component analysis showed that in the first principal component, the LAI , biomass, yield, plant height, SPAD , F v /F m , IPAR , and RUE had a positive correlation, and the HI had a negative correlation. The LAI , yield, plant height, SPAD , HI , and RUE had a positive correlation, but biomass, F v /F m and IPAR had a negative correlation in the second principal component. Across the different HA treatments, the comprehensive scores were T5 > T4 > T3 > T1 > T2, with values of 2.13, 1.38, −0.17, −0.34, and −3.00, respectively. According to the principal component analysis results of each index, the T5 treatment was better than the T4 treatment.

Suggested Citation

  • Ennan Zheng & Mengting Qin & Zhongxue Zhang & Tianyu Xu, 2022. "Humic Acid Fertilizer Incorporation Increases Rice Radiation Use, Growth, and Yield: A Case Study on the Songnen Plain, China," Agriculture, MDPI, vol. 12(5), pages 1-13, April.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:5:p:653-:d:806872
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    References listed on IDEAS

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    1. Chen, Peng & Nie, Tangzhe & Chen, Shuaihong & Zhang, Zhongxue & Qi, Zhijuan & Liu, Wanning, 2019. "Recovery efficiency and loss of 15N-labelled urea in a rice-soil system under water saving irrigation in the Songnen Plain of Northeast China," Agricultural Water Management, Elsevier, vol. 222(C), pages 139-153.
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    1. Hyoung-Seok Lee & Hyo-Suk Gwon & Sun-Il Lee & Hye-Ran Park & Jong-Mun Lee & Do-Gyun Park & So-Ra Lee & So-Hyeon Eom & Taek-Keun Oh, 2024. "Reducing Methane Emissions with Humic Acid–Iron Complex in Rice Cultivation: Impact on Greenhouse Gas Emissions and Rice Yield," Sustainability, MDPI, vol. 16(10), pages 1-14, May.

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